Sorry, I did derail the conversation a bit. I should have atleast added an /s but I thought that was obvious. Did you hear about the new Star Trek tv series coming out next year? I have high hopes for that one. It will be made by some of the people who were involved in the reboot movies but with a different cast. So rather than re-telling a story about Kirk, Picard, Sisco, or Janeway, or Archer we get to see a new story with new people in what I assume is going to be the time period of The Old Series.
And yes, the Myst franchise with the linking books is exactly what I am referring to. There's a sequel called Uru which came out in the early 2000s which allowed you to explore Dni the city (Where Atrus was trapped in the first game) as well as the history and culture of the civilization. There is an image on a myst thread here that is a few posts down that embodies what I envision of someday seeing in Rising World:
http://mystonline.com/forums/viewtopic.php?t=18386
Here's a screenshot of part of the underground city. It really doesn't do it justice but no picture can really capture the city in its entirety since it is so massive and spans a cavern atleast several miles wide with a deep lake in the middle: